Since yesterday I own a RIPE Atlas probe, that means I am a part of the biggest Internet measurement network ever made. With the collected data from the probes it is possible to monitor a big part of the Internet, independent from the Internet service providers. The data is used for science and monitor purposes. The probe has the ability to do checks, some of the common checks are visualized. With every check (mainly uptime) you earn credits and with enough of them you can create checks of your own and the check will be executed by the Atlas-network.
At home I put the probe in a separated network, but in fact there is no socket (remote and local) running on the probe.
There are a lot of Atlas probes out there check out the network coverage.
The Atlas probe is for free. Please join the Network and help to monitor the Internet.